Re: unexpected paging during large file reads in 2.1.127

Rik van Riel
1998-11-17T23:01:05Z

On Tue, 17 Nov 1998, Stephen C. Tweedie wrote:
> On Tue, 17 Nov 1998 07:42:12 +0100 (CET), Rik van Riel
> <H.H.vanRiel@phys.uu.nl> said:
>
> > I meant the page aging that occurs in vmscan.c, where we
> > decide on which page to unmap from a program's address
> > space.
>
> For the last time, NO IT DOES NOT. Read the source. Linus removed it.
> We do not use page->age AT ALL in vmscan.c in current 2.1 kernels.

I just learned that answering questions from memory is
not a good idea when reality changes under your nose :)

I'll try to remember this, really...

> This change improves low memory performance very measurably in all
> tests I have tried so far.

OK, I agree with these changes and have seen a bit of
improvement on my own (72M) system too.

cheers,

Rik -- slowly getting used to dvorak kbd layout...
+-------------------------------------------------------------------+
| Linux memory management tour guide. H.H.vanRiel@phys.uu.nl |
| Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ |
+-------------------------------------------------------------------+